Drive bushing for rotary drilling machines



March 11, 1.930. E. E. GREVE DRIVE BUSHING FOR ROTARY DRILLING MACHINES 2 Sheets-Sheet l Filed Dec. 1925 IN VEN TOR.

m R m T A March 11, 1930. E. E. GREVE 1,749,809

DRIVE BUSHING FOR ROTARY DRILLING MACHINES Filed Dec. 1925 2 Sheets-Sheet 2 7 INVENTOR. 7 -e/- ATTORNEY Patented Mar. 11, 1930 1,749,809

UNITED STATES PATENT OFFICE EDGAR E. GREVE, F BELLEVUE, PENN SYIVANIA DRIVE BUSHING FOR ROTARY DRILLING MACHINES Application filed December 24, 1925. Serial No. 77,672.

My invention relates to improvements in- Figure 3, an elevational view of the bushrotary drilling machines and more particuing of the form of Fig. 1' 'larly to a new and improved drive bushing Figure 4, a part elevational and a part secemployed in such machines for effecting an tional view showin a portion of a rotary engagement between a rotatable driving drilling machine an agrief stem, and show- 66 member of such machines and amember coming the drive bushing connecting the grief inonly called a grief stem, the latter being stem and the drive ring of the rotary drilling secured to the upper end of a string of drillmachine; ing tubing. The grief stems are usually non- Figure 5, a top view showing a modified 1e circular in cross section and as heretofore form f drive bushing; in this form the bush- 0 used, are designed to engage flat fixed suring is shown as an integral structure; and faces on the interior of the drive bushings; in Figure 6, a h I'iZ HtaI sectional View, the Operation the stem has a free longitudinal or Section being taken on line VIVI of Fig. 3. vertical movement in the bushing. As illustrated, the drive bushing imay be In the'operation of drilling and particuformed in tWO halves as ShOWH by the forms larly when a very hard formation is encoun- 0f Q' 1 m 1' as n i gr l m mber, the tered, considerable torsional strain is placed later form being shown by Fig. 5; in either on the grief stem, this strain sometimes causes form the bushing is provided With grief stem the stem to twist and bite or cut into r b 'yielding or movable contacting members and come engaged with the bu hing, Th h rd has at central opening for the reception of 70 formation will also at times, cause the drill the g ief t m, th nfiguration of the openstring with the aid ri f t t jump, up ing being dependent on the shape of the nonand down, and if the grief stem is bent or Circular grief Stem p ye cau ht i th b hi thi j m i move- In Fig. 4 of the drawings, I have shown me t will lift th b hi t f th d iv the drive bushing in position in a rotary 75 ri i some cases cause even more t bl drilling machine and engaging a portion of Among the objects of the present inv a grief stem A. T he rotary may be of any ti ar t r vid means f d i th desired construction; as shown, it includes friction between the drive or grief stem and a rotatable 11191111191 5 having a g 6 the drive bushing; also to prevent the grief formed h re n; Said gear ring is designed 8 t f b di i or b i ht i th to cooperate with a gear wheel 7 carried on d i b hi d t id a d i b hthe end of a shaft 8. 9 designates the drive i h i i ldi or bl t t ring of the rotary and 10 a spider mounted bers adapted to engage the sides of th d i therein and v adapted to receive the 'drive stem when the parts are assembled in a rotary gd illi hi The drive bushing constituting my inven- Another object of the present invention is U011 y be made: above Statelh 111 P to provide a drive bushing of simple construe more parts, or as an 1ntegral structure. .I he tion, and of such a character that it may be g fl generally g a readily applied to grief stems of Various ly compiises a conical tapeiing body L and an upper flan 'e 13 runnint entirely around i f havmg f g i s a 1 1 the structure 5nd adapted 65 be seated on the n e accompa y g r W 11c 1 shouldered portion 14 of the spider 10. In

lustfate app.hcat10nS 9 my mvenilon all of the forms illustrated the bushing is Figure l a top View bushing provided with a central opening having the constructed in accordance wlth my inv walls thereof shaped to receive non-circular havlng a q rcelvlng QP g grief stems, varying in contour; that is to say, Figure 2, 3. similar v1ew ShOWlIlg the bLlShthe pening may be a, square opening 35 ing formed with an opening designed to reshown in the form of Fig. 1, or it may be an 50 ceive a grief stem of fluted form; irregularly shaped opening designed to rehorizontal planes,

. vertically signed to receive eeive, for example, a fluted grief stem as shown in the form of Fig. 2. In all of the constructions illustrated, I provide a plurality of movable contacting members for the bushing, said contacting members being in the form of a plurality of rollers arranged to engage the sides of the grief stem.

As shown by Fig. 1, designates a number of rollers extending inwardly from the periphery of the bushing body, to near the center of the bushing structure, and 16 designates a series of long rollers arranged one above the other and at right angles with the rollers 15.

The short rollers 15 are arranged in four vertically'extending rows, four of the rollers being in the same horizontal plane and arranged in the two part bushing so that they I will project into the stem receiving opening B and engage two sides of the square grief stem A at a certain level. Other similar rollers 15 disposed in other horizontal planes are designed to engage corresponding faces on the grief stem at different levels, as will 3 be clearly understood.

The long rollers 16 are arranged in two vertically extending rows and indifferent and like the rollers 15, project into the opening 13 in order to make contact with and engage opposite faces of the grief stem. The rollers 16 are positioned in extending planes at right angles with the vertical planes of the rollers 15.

In the form of Fig. 2, the bushing is dea fluted grief stem, not shown, and in this construction I have shown a series of short rollers 15 and a series of short rollers 16* arranged to provide contacting members for all of the flat faces of a grie stem of the contour stated.

In the integral bushing structure shown in Fig. 5, I provide two sets of contacting members or rollers 15 and 16 these rollers 15? and 16 ,owing to the fact that the bushextending throughout the width of the opening B The contacting members of this form are arranged in vertically extending rows at right angles with each other and with. the rollers of each row located in different horizontal planes, as in other forms shown.

The means shown for maintaining the respective movable contacting rollers in position in the roller receiving openings of the bushing include keys or pins 17 designed to be positioned in pockets or cutouts 18, formed in the bushing, and co-act with bosses 19.

20 designates grooves formed in the bush-. ing for the purpose of enabling lubrication of the rollers.

7 What I claim is 1. A drive bushing for rotary well drilling machines having a central stem receiving opening, a plurality of drive stem engaging roller contacting members mounted in the bushing and having portions thereof projected'into the opening, and means for securing the contacting members in the bushing, said bushing being formed with roller receiving openings in which the rollers are disposed.

2. A drive bushing for rotary well drilling machines having a central stem receiving opening,two roller'drive stem contacting members carried thereby and each having a portion thereof projected into the opening, one member arranged at right angles with the other member, said bushing being formed with roller receiving openings in which the rollers are disposed, and means for securing the contacting members in the roller receiving openings of the bushing.

3. A drive bushing for rotary well drilling machines having a central stem receiving opening, a series of roller drive stem contacting members arranged one above the other, a second series of roller drive stem contacting members arranged one above the other and at right angles with the first series,

said contacting members having portions projected into the opening, and means for securing the contact members in the bushing.

*4. A drive; bushing for rotary well drilling machines having a central stem receiving opening and a plurality of roller receiving openings, two roller drive stem contacting members carried thereby in said roller receiving openings, and each'having a portion thereof projected into the stem receiving opening, one member arranged at right angles with the other member, and means for securing the contacting members in the roller receiving openings of the bushing including 1 a detachable pin entered in a pocket of the bushing.

In testimony whereof I affix my signature.

, EDGAR E. GREVE.

. ing is in one piece instead of being a split bushing, may all be long rollers, 1. 'e., rollers 

